Yes, you are right, to a certain extend, but most hardware, or provider related subjects, are Australian "tainted" so you could get stuck with certain questions that one does not come accross in Australia, and there will be greater number of forum users that are Australian.
But for general technical (voip) questions it should not matter.

Using VoIP can significantly reduce your telecommunications costs. You can use your VoIP system anywhere not depending on where you are, for example, in business trip, in hotel, or at home. Also, you can talk on your laptop. Voip providers. VoIP systems allow you to do things that are simply not possible with traditional phone technology. You can talk as often and as long as you like for free.

stra111 you could have just posted the link to your site in a new post no need to disguise it way down here. It seems like a useful service and there's no problem putting up relevant ads/services in this forum.